Soaking-pit furnace



Allg. 13, 1929. L s. G 'WQRTQN l y soAKlNG PIT FURNACE Filed Feb, 2', 1928 2 sheets-snee@ l llg. 13, 1929. l 5 Q WQRTQN 1,724,058

SOAKING PIT FURNACE Filed Feb. 2. 1.928 2 Sheets-Sheet 2 Patented ug. 13, 1929..

UNITED STATES SAMUEL G. WORTON, 0F DUQUESNE, PENNSYLVANIA.

SOAKING-PIT FURNAGE.

Application filed February 2, 192B. Serial No. 251,401.

This invention relates to soaking pit furnaces and more particularly to an improved bottom structure for lthis class of furnaces and has for its object the provision of an improved form and composition of bottom 'lining which will be more or less permanent and will replace the beds of coke breeze heretofore used to cover the bottom of the pits of such furnaces, and which have to be replaced every twentyfour hours When the furnaces are in use.

Another object is ,to provide a hard -and substantially permanent bottom lining over Which the molten cinder collected in the furnace pits will flow so asto permit the collecting of said cinder from which a con siderable quantity of iron may be recovered.

lll/ith the coke breeze beds or linings here tofore used no cinder can be recovered since it is mixed ivith a large amount of colte breeze, prohibiting its use in either the blast furnace or the open hearth furnaces.

lln the drawings: A

Figure 1 is a longitudinal sectional elevation through a furnace constructed in ac# cordanee with this invention.

Figure 2 is a transverse section taken on the line lllwllll of Figure 1. a

Figure 3 is an elevation showing the means for operating the slag hole closures.

Referring more particularly to the drawings.y the letter A designates the furnace as a whole, which is divided by the usual Walls to form regeneratior chambers 2 and il, a bank of pits it and a cinder tunnel The bottoms of the pits/l are supported on beams (Lend each is composed "i a bottom casting i supported on the ocams 6 and a layer of brick 8 is laid over the casting T. rl `hc side walls of each of tbepits -l are also formed from brick, as, usual.

The bottom casting 7 is provided with a centrally arranged slag discharge port il which communicates With a port frame 1U supported on the beams tl and closed at'its lower end by a hinged closure 12. Thez elo sures 12 are connected to operating cables 13 hy levers 1a that each of said closures may be opened and closed by operating the drums 15 to which tb cables are connected. lflach of the drums provided with an individual worm and worm-wheel operating mechanism 1d.

'.lhe bottoni yiiortion of each of the pits el is provided with a protective substantiallyr or semi-permanent refractory lining 18 which-extends from a point on the side Walls in line With the bottom of the ports 19, connecting pits with the regenerators, downwardly to the brick bottom Wall 8 and across the bottom Wall 8.

The lining -18 is thinnest or of least depth atits upper edge and increases in thickness or depth downwardly to the point of juncture of the bottom and side Walls of the pit and .then is gradually thinner or of less depth from the side Walls inwardly to the slag port at the center of the bottom so that the molten cinder or slag will drain over the bottom lining and out through the port 9.

In actual practice I have found that a lining having a thickness of approximatelyv two inches at its upper edge and increasing to approximately seven inches at the junen tion of the side and bottom Walls, and then tapering over the bottom wall to about six inches at the discharge port 9, gives good results. v

The lining may be composed of mixtures of various refractory materials, however, ll have found that very good results are obtained from a lining composedv of a mixture of calcined dolomite, crushed to lumps of one-hrlf inch or less, finely divided or ground open hearth cinder and tar. The

'calcined dolomite forms a durable, refractory'base, the finely divided open hearth einder filling up the interstices and the tar serving as a binder to bond the mixture together.

The slab or einder port 9 is, of course7 continued up through. the. bottom briclr wall 8 and the lining 18 and is adapted to be plugged when the pit is in use by lirst covering the door or closure 12 With a layer of loam 20, and then iillingtthe remainder of the port with a body of colre' breeze El which is preferably mounded up slightly above the lining 18 and covered *with a layer of raw dolomite 22. f

vlllhen it .is desired to draw olf the cinder or slag it is only necessary to open the closure 'l2 and poke the plugging material in the port il slightly to loosen the same vand the ci nder or slag will immediately run out due to the slope ot the lining 18 and the hard nature of the lining.

The lining 1S is substantially permanenl'` 'lil lic

55 to 70 per cent.

While I have shown and described a spe-l cific embodiment of my invention it will be understood that I do not wish to be limited thereto since various modifications-may be made without departing from the scope of my invention as defined in the appended claims.

I claim:

l. The combination with a soaking pit lfurnace having each pit provided with brick bottom and side walls and 'a centrally arranged slag hole opening through said bottom wall, of a semi-permanent refractory lining on the bottom of'said pitand eX- tending upwardly along the side walls thereof, said lining being of least depth at its upper edge-and having its greatest depth 30 of said pit, and being of slightly decreas,

at the junction of the side'and bottom walls ing depth from the side -walls of the pit toward the center of said pit so as lto form an inclined bottom over which the-slag will fiow to saidi slag hole, said slag hole being normally closed at its lower end by a remov- 'the slag to fiow able closure and-filled to a point above the level of said lining with coke breeze and tory lining on the bottom of said pits and extending upwardly along the side walls thereof, said lining having its bottom wall inclined toward said slag hole so as to permit the slag to fiow from the pit by gravity, said slag hole being normally closed at its lower end by a removable closure and filled to a point above the level of said lining with a granular filling material. A

3. The combination with a soaklng pit furnace having the usual pits provided with brick bottom and side walls and a centrally arranged slag hole opening through said bottom wall,.of a semi-permanent refractory lining on the bottom of said pits and extending upwardly along the side walls there of, said lining having its bottom wall inclined toward said slag hole so as to permit from the pit by gravity, said slag hole being 'normally closed at its lower end by a hinged closure and filled to a point above the level of said lining with a granular filling material, at least the upper exposed face of said filling material being-coinposed of refractory material.

-In testimony whereof, I have hereunto signed my name.

SAMUEL e. WoRToN. 

